does tobacco decrease testosterone Smoking Testosterone?—Yes and No Vaping's Impact on Testosterone and

Barben M, Schori C, Samardzija M, Grimm C

Altrias subsidiaries include Philip Morris USA Inc., John Middleton Co., UST LLC, Helix Innovations LLC and its foreign affiliates and NJOY LLC

Exposure to secondhand smoke (SHS) is associated with coronary heart disease (CHD) in nonsmokers, and research suggests that the cardiovascular effects of SHS are nearly as large as those with active smoking, according to the study background

You could argue that 17+ year olds are mature enough to know what not to do, but many could still fall under the influence that they give you a good time (and people pretending to be +17 while being way under that mark)